Machine for cutting boards



Patented Oct. 28, 1890.

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J B BURRELL MACHINE PoR CUTTING BOARDS.

(No Model.)

No.l439,321.

JAMES BIRNEY BURRELL,

PATENT OFFICE.

OF VVRIGHTS, CALIFORNIA.

MACHINE FOR CUTTING BOARDS.

SPECIFICATION forming part of Letters Patent No. 439,321, dated October 28, 1890.

Application tiled November 27, 1889. Serial No. 331,783. (No model.)

To all whom it may con/cern:

Beit known that I, JAMES BIENEY BUREELL, a citizen of the United States, residing at Vrights, in the county of Santa Clara and State of California, have invented an Improvement in Machines for Cutting Boards; and I hereby declare the followin g to be a full, clear, and exact description thereof.

My invention relates, generally, to the class of wood-working machinery, and especially to that class which 'is designed for cutting wood into slabs or boards, and more particularly for cutting boards from logs.

My invention consists in the peculiar constructions, combinations, and arrangement hereinafter fully described, and specifically pointed out in the claims.

The object of my invention is to provide an effective and durable machine adapted for cutting boards from logs.

Referring to the accompanying drawings, Figure l is a side elevation of my machine. Fig. 2 is a top View of the same.` Fig. 3 is an end view. Fig. 4 is a bottom View of the knife or bit.

A is a fined guide-rail consisting of an oblong plate having oppositely-beveled top and bottom edges, (shown at 60,) and a central longi- Y tudinal strengthing-rib a. To this guide-rail are secured the two fixed bearing-blocks B, having on their lower ends the piercing-points b. Through one side of the blocks `pass the holding-screws or screw-bolts b', the tops of which are provided with wrench-holds, as shown, whereby the ends of the screw-bolts may be projected below the blocks in order to tix them to the log, as will be presently described. In the upper portion of these blocks are freely pivoted the swinging tubular-holders C, in which are inserted adj ustably the shanks CZ of the dogs D, said Shanks being held in position by the set-screws c, which enable the dogs to be set in or out for the purpose of accurately placing and holding the guide-rail in a perpendicular position. 'Upon the beveled top and bottom edges of the guiderail A is mounted by corresponding bevels (shownin Fig. 3) the sliding carrier E. The outer face of this carrier has a vertical bevelsided groove or seat e made in it, in which the bit-plate F is fitted, as shown in Fig. 2. The lower end of this bit-plate is provided or has connected with it the bit or knife G. This is a double-ended one, having planingpoints at each end, and at its middle the scoring cutting-edges gfor cutting the sides of the shaving, said scoring-edges being carried down below the horizontal plane of the points, so that they will score the wood on the previous movement of the knife or bit before its planing-points cut the shaving out. At the top of the bit-plate is formed or secured a nut I-I, in which is seated the vertical screw I, the lower end of which is properly stepped, as shown at t' in the sliding carrier. The lower end of the screw is provided with a ratchetwheel or disk J, the lteeth of which engage with a xed rack K, one at each end, the body of which is secured to the fixed guide-rail A, as shown in Fig. l. Any suitable means may be employed to move the carrier back and forth along the fixed guide-rail, and for this purpose I have'shown a cord or rope L attached to each side of the carriage.

-The operation of the device is as follows: It is intended to be mounted upon a log, which I have shown in dotted lines in Figs. l and 3. It is held firmly to the log by turning down the screw-bolts b of the bearing-blocks B s0 that their Vpoints Will enter the log; but it is temporarily held in position before and While these bolts are being screwed down by the holding-points b of the blocks, which penetrate the wood from the weight of the machine. The whole device is further and securely held to the log by the dogs, which, on account of their adjustment, are adapted to throw the guide-rail into a perfectly perpendicular position. Wheneverything is ready, the carrier is drawn back and forth on the guide-rail. On the trip over, the scoringedges of the bit cut o n each side, while on the trip back the planing-point cuts out the shaving, while the scoring-edges cut deeper for the next shaving. On the forward trip again the other point cuts out the shaving, while the scoring-edges cut deeper into the sides again. Now at each trip of the carriage the bit is fed down to its work. This is effected by the ratchet-wheel of the screw coming in contact withthe xed racks at the ends of the machine.

As shown in the drawings, the operation is this: O11 the movement to the left the planer- IOO bit is down to its work, and as the ratchet of the screw passes the fixed rack at that end it slips the teeth of said rack, which does not, therefore, affect the feed of the bit. As it passes the rack at the other end, it again slips the teeth; but as it returns, and just before the bit reache-s the log, the ratchet-wheel of the screw comes in contact with and is turned by the rack at the left-hand end, so that the screw is turned, and thereby, through the fixed nut above, the bit is fed down. At the first end, just after it leaves the log, the ratchet-wheel again comes in contact with the rack at the right-hand side and engaging its teeth the bit is again fed down, so as to be ready for the forward trip. Thus on each trip the bit is fed down to its work and in time will cut through the log or through such portion of it as may be necessary.

The device can be placed in a horizontal position as well as a vertical position, so as to cut into the log from'the side, when desired, after it has cut down perpendicular-1y the required number of boards.

I am aware of the employment in some planes of bits having a-planer-point and scoring-edges, and I am also aware of machines formaking that article of manufacture known as excelsior, and in which a bit is reciprocated over the block and the block itself continually fed up to the bit. I do not therefore claim, broadly, the cutting into wood by ghet reciprocating movement of a bit or knife;

What I do claim as new, and desire to secure by Letters Patent, is

l. In a machine for cutting boards, the fixed guide-rail, the carrier mounted and adapted to slide thereon, and the bit-or knife mounted on the carrier, in combination with the bearing-blocks B, secured to the fixed guide-rail and engaging the log, whereby the rail is primarily held to said log, and the screw-bolts b', passing through said `blocks and having their points adapted to penetrate the log, substantially as described.

2. In a machine for cutting boards, the fixed guide-rail, the carrier mounted and adapted to slide thereon, and the bit or knife of the carrier, in combination with the fixed blocks B, secured to the rail, the penetratingpoints b of said blocks for holding the rail primarily to the log, and the screw-bolts b', seated in said blocks, the points of which are adapted to penetrate the log, substantially as described.

3. In a machine for cutting boards, the fixed guide-rail, the carrier mounted and adapted to slide thereon, and the knife or bit of the carrier, in combination with the fixed blocks B, secured to the guide-rail, and the dogs D, hinged to the blocks for holding the machi ne to the log, substantially as described.

4. In a machine for cutting boards, the guide-rail, the sliding carrier, and the bit or knife of the carrier, in combination with the blocks B, secured to the guide-rail, the tubular holders hinged to the blocks, the dogs fitted adjustably in said holders, and the setscrews for holding the dogs where adjusted, substantially as described.

5. In a machine for cutting boards, the fixed guide-rail, the sliding carrier thereon, and the bit or knife of the carrier, in. combination with the blocks B, secured to the guide-rail and having the piercing-.points b, the screw-bolts b', seated in the blocks and having their lower ends adapted to penetrate the log, and the adjustable dogs D, hinged to the blocks, substantially as described.

6. A machine for cutting logs, consisting of the combination of the guide-rail, the bearing-blocks B, secured thereto and havingthe screw-bolts b', and the :adjustable dogs D, whereby the rail is fixed to the log and adjusted to a perpendicular position,the carrier mounted on the rail and adapted to slide thereon, the vertically-movable plate seated in the face of the carrier, the bit or knife at the lower-end of the plate, and the means for feeding the bit or knife, consisting of the nut on the top of the plate, the screw seated in the nut, the ratchet-wheel on the screw, and the racks on ends of the guide-plate for engaging the ratchet-wheel, substantially as described.

7. In a machine for cutting logs, the double- JAMES BIRNEY BURRELL.

Vitnesses:

JOHN BELL, H. B. BELL.

ICO 

